Pascal's law states that "Pressure exerted by liquid in an enclose vessel is transmitted equally". This law is applicable for the gases also.
This is the detailed note on pascal's law and its application in hydraulic press.

We know that due to upthrust, objects tend to lose weight when immersed in liquid. Archimedes principle states that "If an object is partially or completely immersed in the liquid, the weight of liquid displaced by the object is its upthrust".
This notes provides an information about Archimedes principle of grade 10.